Perennial herb, 0.6-2.5 m tall with large aromatic roots. Stem pilose, dark purple to greenish purple, with 4-5 leaves; rhizomes thick and horizontal. Leaves ternately compound, spreading, 50-83 cm long, 54-87 cm wide, purple at nodes; stipules narrowly triangular to lanceolate, not leafy, glabrous, ciliate at margin, 1.2-1.5 cm long, 0.4-0.9 cm wide, thick papery; petioles 15-30 cm long, purple; leaflets thin papery, the pair of leaflets below the terminal leaflet ovate, other leaflets ovate to broadly so, 7-20.5 cm long, 4.5-14 cm wide, acute at apex, subcordate to cordate at base, commonly oblique on lateral leaflets, doubly serrate at margin; lateral veins 8-9 on each side, conspicuous on both surfaces, leaflets green, nearly glabrescent on upper surface, pilose on lower surface, petiolules 0-3 cm long, pilose. Inflorescence terminal and axillary, pubescent; axillary inflorescences 6-21 cm long; terminal inflorescence 15-40 cm long, 12-26 cm wide, consisting of numerous umbels, primary inflorescence branches 15-25, racemosely arranged on a main axis, often 3-5 forming a circle on the upper part of the main inflorescence axis, each primary branch 3-14.5 cm long, consisting of 1-10 umbels, with a few lateral umbels bearing no fruits (functionally male umbels); terminal umbels 20-25-flowered, pedicels pubescent, 6-8 mm long, tip enlarged conspicuously at anthesis, somewhat slightly enclosing the base of the hypanthium; lateral umbels 10-20-flowered, pedicels 3-5 mm long; bracts of primary branches linear, more or less pilose, ciliate at margin, 3-5 mm long, 0.5-1 mm wide; bracteoles linear, 1.0-1.5 mm long, 0.2-0.3 mm wide, ciliate at margin. Sepals triangular, 0.2-0.3 mm long and wide, glabrous, persistent on fruits. Petals ovate, greenish white to white, with a conspicuous vascular bundle in the middle, 1.4-1.6 mm long, 0.9-1.1 mm wide, spreading to recurved at anthesis. Stamens 5, erect at anthesis, filaments 1.3-1.5 mm long, anthers oblong, whitish yellow, 0.4-0.5 mm long, 0.2-0.3 mm wide. Ovary 5-locular, styles 0.6-0.7 mm long at anthesis, base of styles more or less enlarged, appearing like a stylopodium. Fruits globose, dark purple to purple, turning dark maroon-red when mature, 4-4.5 mm long, 3.5-4.5 mm wide, persistent styles divided to the middle, 1.3-1.5 mm long. Seeds kidney shaped, whitish gray, smooth, 2-2.2 mm long, 1-1.2 mm wide, 0.2-0.25 mm thick.
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